Last Modified: 04-05-2023 |
6.11:8.1.0 |
Doc ID: RM100000000YIZK |
Model Year Start: 2017 |
Model: Sienna |
Prod Date Range: [08/2016 -
] |
Title: UA80E (AUTOMATIC TRANSMISSION / TRANSAXLE): AUTOMATIC TRANSAXLE SYSTEM: U010087; Lost Communication with ECM/PCM "A" Missing Message; 2017 - 2020 MY Sienna [08/2016 - ] |
DTC
|
U010087
|
Lost Communication with ECM/PCM "A" Missing Message
|
DESCRIPTION
The engine control unit and transmission control unit are located inside the ECM. The engine control unit intercommunicates with the transmission control unit using CAN communication.
If there is a problem in this intercommunication, the ECM stores this DTC.
DTC No.
|
Detection Item
|
DTC Detection Condition
|
Trouble Area
|
MIL
|
Memory
|
Note
|
U010087
|
Lost Communication with ECM/PCM "A" Missing Message
|
1. Diagnosis Condition 2. Malfunction Status 3. Malfunction Time 4. Other
-
The ignition switch is ON and battery voltage is 8 V or more.
-
No intercommunication between engine control unit and transmission control unit
-
1.25 seconds or more
-
1-trip detection logic
|
ECM
|
Comes on
|
DTC stored
|
SAE Code: U0100
|
MONITOR STRATEGY
Related DTCs
|
U0100: Verify communication
|
Required Sensors/Components (Main)
|
ECM
|
Required Sensors/Components (Related)
|
-
|
Frequency of Operation
|
Continuous
|
Duration
|
1.25 sec.
|
MIL Operation
|
Immediately
|
Sequence of Operation
|
None
|
TYPICAL ENABLING CONDITIONS
The monitor will run whenever the following DTCs are not stored.
|
None
|
Battery Voltage
|
8 V or more
|
Ignition Switch
|
ON
|
Starter
|
Off
|
TYPICAL MALFUNCTION THRESHOLDS
Communication signal
|
Lost communication with ECM/PCM
|
CONFIRMATION DRIVING PATTERN
HINT:
-
After repairs have been completed, clear the DTCs and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.
-
When clearing the permanent DTCs, refer to the Clear Permanent DTC procedure.
Click here
-
Connect the Techstream to the DLC3.
-
Turn the ignition switch to ON and turn the Techstream on.
-
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
-
Turn the ignition switch off and wait for 2 minutes or more.
-
Turn the ignition switch to ON and turn the Techstream on.
-
Wait for 2 seconds or more with the ignition switch to ON. [*1]
HINT:
[*1] : Normal judgment procedure.
The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
-
Enter the following menus: Powertrain / Transmission / Utility / All Readiness.
-
Input the DTC: U010087.
-
Check the DTC judgment result.
Techstream Display
|
Description
|
NORMAL
|
-
DTC judgment completed
-
System normal
|
ABNORMAL
|
-
DTC judgment completed
-
System abnormal
|
INCOMPLETE
|
-
DTC judgment not completed
-
Perform driving pattern after confirming DTC enabling conditions
|
N/A
|
-
Unable to perform DTC judgment
-
Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit
|
HINT:
-
If the judgment result shows NORMAL, the system is normal.
-
If the judgment result shows ABNORMAL, the system has a malfunction.
-
If the judgment result shows INCOMPLETE or N/A, perform the normal judgment procedure again.
CAUTION / NOTICE / HINT
NOTICE:
-
Perform the universal trip to clear permanent DTCs.
Click here
-
Perform registration and/or initialization when parts related to the automatic transaxle are replaced.
Click here
PROCEDURE
1.
|
CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC U010087)
|
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Transmission / Trouble Codes.
(e) Read the DTCs using the Techstream.
Result
|
Proceed to
|
Only DTC U010087 is output
|
A
|
DTC U010087 and other DTCs are output
|
B
|
A
|
|
|
(a) Replace the ECM.
Click here
|